Toyota Previa 1991-1997 Repair Information

Back-up Light/Neutral Safety Switch

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The back-up light switch is incorporated with the neutral safety switch.

REMOVAL & INSTALLATION



1991-95 Models

See Figures 1 through 8

  1. Raise and safely support the vehicle.
  2.  
  3. Locate the neutral safety switch on the automatic transmission.
  4.  
  5. Disconnect the wiring harness from the switch.
  6.  



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Fig. Fig. 1: Disconnect the wiring harness from the neutral safety switch

  1. On the 3-speed transmissions, the oil cooler lines may need to be disconnected to access the neutral safety switch. a bracket may need to be detached also on some models.
  2.  



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Fig. Fig. 2: Disconnect the lines on the oil cooler



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Fig. Fig. 3: Remove the bracket retaining the two pipes



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Fig. Fig. 4: Inspect the threads of the pipe and replace if damaged

  1. Unstake the lockwasher.
  2.  
  3. Remove the nut and bolt, then extract the neutral safety switch.
  4.  



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Fig. Fig. 5: Remove the nut on the neutral safety switch



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Fig. Fig. 6: There will be two washers and one nut



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Fig. Fig. 7: The bolt is on the side of the switch

  1. Remove the lock washer and grommet.
  2.  



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Fig. Fig. 8: Extract the switch from the transmission

To install:
  1. Attach the wiring harness to the switch.
  2.  
  3. Insert the neutral safety switch onto the manual valve lever shaft and temporarily tighten the adjusting bolt.
  4.  
  5. Install the grommet and a new lock washer. Install and tighten the nut to 35 inch lbs. (4 Nm).
  6.  
  7. Align the neutral basic line and the switch groove, then tighten the adjusting bolt to 48 inch lbs. (5 Nm).
  8.  
  9. Bend the tabs of the lock washer. Make sure you bend at least two of the tabs.
  10.  
  11. Lower the vehicle. Test the function of the system.
  12.  

1996-97 Models
  1. Raise and safely support the vehicle.
  2.  
  3. Locate the neutral safety switch on the side of the automatic transmission.
  4.  
  5. On the 3-speed transmissions, the oil cooler lines may need to be disconnected to access the neutral safety switch.
  6.  
  7. Disconnect the wiring harness from the switch.
  8.  
  9. Pry off the lock washer and remove the nut.
  10.  
  11. Unbolt and separate the switch from the transmission.
  12.  

To install:
  1. Attach the wiring harness to the switch.
  2.  
  3. Postrion the switch on the transmission and tighten the bolt to 9 ft. lbs. (13 Nm).
  4.  
  5. Install a new lock plate and tighten the nut to 35 inch lbs. (4 Nm).
  6.  
  7. Stake the nut with the lock plate. Adjust the neutral safety switch.
  8.  
  9. Lower the vehicle. Test the function of the system.
  10.  

ADJUSTMENT



See Figure 9

Check that the engine can be started with the shift lever only in the N or P position, but not in any other positions. If not, carry out the following adjustment.

  1. Loosen the neutral safety switch bolt and set the adjustment shift lever to N .
  2.  
  3. Align the groove and neutral basic line.
  4.  



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Fig. Fig. 9: Alignment of the groove and the neutral basic line

  1. Retain the position and tighten the bolt to 48 inch lbs. (5 Nm) on 1991-95 models and 9 ft. lbs. (13 Nm) on 1996-97 models.
  2.  

 
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